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해석 기법에 따른 KVLCC2 선형의 저항 및 사항 시험에 관한 비교 연구
이인수(I. Lee),석우찬(W. Seok),여홍구(H. Yeo),조용재(Y.J. Cho),이신형(S.H. Rhee) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.1
In this study, comparative studies between double-body and VOF methods were performed using SNUFOAM, specialized in fluid dynamics problems in naval architecture and ocean engineering.Although the double-body method is more efficient in terms of computational resources than the VOF method, but free surface effect was ignored. For comparative studies, resistance tests and static drift tests at drift angle 4° and 12° for a KVLCC2 was conducted. They showed differences in forces and moments and pressure, wall shear stress and skin friction lines were identified to investigate the differences.
곡률 변화에 따른 코안다 와류 고리 추진기의 유동 해석
허영민(Y. Heo),서인덕(I. Suh),이인수(I. Lee),석우찬(W. Seok),이신형(S.H. Rhee) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.4
The vortex ring thruster (VRT) is a propulsion system mimicking the propulsive technique of Mollusca, such as squids and jellyfish. VRT’s acknowledged advantages include low noise generation, delicate attitude control, and precise maneuverability. However, due to the low propulsion efficiency, its application is limited to low-speed unmanned underwater vehicle (UUV) only. In the present study, the propulsion performance evaluation of Coanda vortex ring thruster (CoVoRT) with different curvature was performed to examine the application of CoVoRT. The flows around the typical VRT and CoVoRT were analyzed using SNUFOAM, which was open-source toolkit CFD code based on the OpenFOAM. For computational validation, the CFD results for the flow around VRT were compared with the previous simulations and experimental results. Then propulsion performance of VRT and CoVoRT was compared in terms of the PPEI, and the vortex ring formation process. The results showed that CoVoRTs PPEI is approximately 50% higher than that of VRT. Also, the vortex ring formation by CoVoRT was enhanced by the Coanda jet.